Seat support



sepf.`17, 194e. J. P. DE Rass SEAT SUPPORT Filed Aug. 4, -1941 5 Sheets-Sheet l l y l5 IT 29| aan .32| 3 INVENTOR JOHN/.3 DeRosa /N/u/j 94. (/aw-y ATTORN EY Sept. 17, 1946. J. P. DE RosE SEAT SUPBORT 5 Sheets-Sheet 2 Filed Aug. 4, 1941 INVENTOR JOHN P DEROSE BY e2 my M- ATTORNEY Sept. 1,7, 1946. J". P. DE Rose:

SEAT SUPPORT E uns. fmlg? @www l l; .,:W4 w W m S m P. m m N wm! 5 Q ,f1 a@ J v m Sept. 17, l1946. J. P, DE RosE 2,407,771

SEAT SUPPORT Filed Aug. 4, 1941 5 Sheets-Sheet 4 -4 Mii;

INVENTOR BY don/v P De Rose I J. P. lzuszRosE;`

SEAT SUPPORT sept. 17, 1946.

Filed Aug. 4, 1941 5 sheets-sheet 5 W u l las BYdoH/v PDE/Q05 E.

M14. @my

ATTQRNEY Patented sept. 17, 1946 UNITED STATES PATENT l. OFFICE Y 2,407,771l i I 1 SEAT SUPPORT John P. De Rose, Albany, cani. Application August 4, 1941, Serial N0. 405,279

8 Claims.

I'he invention relates to an adjustable seat support, and embodies certain improvements over the disclosures of my U. S. Patent No. 2,179,085, and my U. S. Patent No. 2,298,351.

A general object is to provide an improved seat mounting for height and/or angularity and/or fore-and-aft adjustments of the seat with respect to a fixed base of the mounting.

Another object is to provide a re-positioning control such that only corresponding adjustments are permitted at the opposite seat sides.

A further object is to provide for a resetting of the position-determining elements with a minimum of manual effort.

The-invention possesses other objects and features of advantage, some of which, with the foregoing, will be set forth or be apparent in the following description of typical embodiments thereof, and in the accompanying drawings, in which,

Figure 1 is a left-side view of an assembly of a seat and its mounting embodying the features of present invention and disposed on a support; ing oor, the seat bottom being primarily shown as level, with other adjusted settings thereof being indicated in dash lines.

- s elevations at the lines l 3-13 and lli- .14 in Figa supporting surface II such as that provided by a oor I2. I'he seat 9 is of a usual upholstered type having a bottom plate or frame I31 for direct mounting on the adjustable support structure, the seat structure being rigid against distortion thereof. The present seat unit, while of gen- Figure 2 is a fragmentary upright section through the seat mounting structure with the seat tilted forwardly in one indicated position of Figure 1.

Figure 3 is a plan view of the seat support taken at the plane of the line 3-3 in Figure 1.

Figure 4 is a sectional elevation at the broken line 4 4 in Figure 3.

Figure 5 is a front view of the assembly of Figure 1, a major portion of the seat back being broken away.

Figures 6 and 7 and 8 are fragmentary sectional views taken respectively at the line 8-6 and 'l-'I and 8 8 in Figure 2. l

Figure 9 is an enlarged fragmentary plan section taken generally at the plane of support of a seat-carried section of the mounting upon a oorcarried section of the mounting when said sections are related as in Figure 1, said plane of eral utility, has been particularly designed for its installation in a vehicle for use by an occupant thereof. y

Essentially, the present seat support assembly comprises a pair of base members I4 for fixing to the floor I2 to extend upwardly therefrom, a pair of members I5 for fixing to the seatbottom I3 to depend therefrom, and a pair of catch bolts IB and a ro'd I'I engagingboth pairs of members I4 and I5 in a manner to support the former from the latter. The members I4 comprise plate elements of like size and outline having flanges I4' extending transversely therefrom at their bottom edges to provide oor bearings for the plates and a means by which the plates maybe secured to the floor I2 in relatively xed and mutually parallel relation, as by boltsjIB. The members I5 comprise plates of like'size and outline having transverse top edge flanges I5 by which they may be secured to the seat bottom I3, as by bolts I9, for their simultaneous disposal adjacent and parallel to the opposed inner faces of the plates I4, said flanges being directed inwardly andV toward each other.

Near their upper edges and in front portions l thereof, the plate members I4 are provided with support being indicated at the line 9-9 in Fig- 1 ure 10.

Figure 10 is a sectional elevation at the line IO-II) in Figure 9.

Figure 1l is a left-side view of another embodiment of the invention.

Figure 12 is a view of the seat-supporting structure of Figure 1l corresponding to the view of Figure 2.

Figures 13 and 14 are fragmentary sectional like sets of interior slots `2I which are laterally spaced and extend parallel to the base edges of the members with corresponding said slots at like distances therefrom. At corresponding points thereof adjacent the junctures of their front and lower edges, the plate members I5 are provided with transverse guideways which slidably mount the catch-bolts IB for their normal Ytransverse projection from `the plates Iii into corresponding slots 2| 0f the plates I4. The guideways for the bolts I6 comprise aligned openings in the plates I5 and in end portions E2 of brackets 23 extending rigidly from the inner sides of the plates I5, each said bracket having a cylindrically curved arm portion 24 extending above the bolt portion between the plate and the bracket portion 22'.

the influence of a spring 2lwhen the bolt isA operatively engaged ina slot 2I of the base member I4; the arrangement is such that a suilicient rotation of the bolt to move its arm 26 rearl wardly in the slot 25 will withdraw the bolt from its operative position by reason of the sliding engagement of the bolt arm 26 with the forward edge of the slot 25, said edge functioning as a spiral cam. Such a rotation of the bolt to effect its inoperative disposal is arranged toi be'ef" fected by means simultaneously operative upon both arms 26 and hereinafter described.

Near their upper edges and in rear portions thereof, the base members I4 vare provided with interior openings comprising slots 28 extending parallel to the plate base and at rlike distances therefrom, and the members I5 are provided toward their rear ends with corresponding upright slots 29. The rod I'I is constantly engaged through the mutually intersecting pairs of slots 28 and 29 for its lateral sliding through these slots, is arranged to be adjustably spaced from the seat while extending freely through the upright slots 29, and constantly bears on the lowerl edges of the slots 28 as the support means for the rear of the seat. p

With Vthe support-bolts I6 engaged in corresponding slots 2I of the base members I4 and the rod I1 engaged in the horizontal slots 28 of the members, it will be understood that the seat ative catch-bolts 34 to permit a fore-and-aft adjustment of the seat with respect to the base provided by the members I4 is arranged to be effected through an appropriate rocking of a rod or shaft 38 which is journalled in and between the plates I5 at corresponding forward and upper points thereof. As particularly shown, radial arms 33 extend fixedly from the rod 33 inwardly of and adjacent the plates I5 and generally downwardly.

from the-rod, and links 4I connect the arms 39 with the extending ends of the bolt arms 3l whereby a rocking of the rod 38 may simultaneously withdraw both catch-bolts 34. Tension springs 42 extend between the arms 39 and anchorages on the plates I5 forwardly thereof to .constantly and yieldingly urge, through the links 4Il and bolt arms 31, the operative disposition of the bolts 34. At leastl one end of the control rod 38 extends beyond the adjacent base plate I4 and xedly carries aradial arm 43 for use as a handle to effect a rocking of the rod 38 to simultaneously disengage therbolts 34 from the slots 33 of the plate; as shown, the handle 43 is positioned opposite the left side of the seat 9, and the rod 38. is supported thereatby a bracket 44 fixed to and beneath the bottom seatL plate I3.

It will now be noted-that the adjusted support of the back of the seatefrom the rod Il is arf ranged to be effected through a device including is supported upon the base membersr I4 for its x fore-and-aft adiustment while maintained in a set angularity and height relation to the supporting iioor I2. To provide for a maximum degree of fore-and-aft adiustment for the seat, the

slots 2l and 28 are of like length and have their centers spaced as the line of the bolts I6 is horizontally spaced from the rod I'I. To insure equal fore-and-aft adjustments of the opposite seat sides, gears 3l are xed on the extending ends ofthe rod I'I and constantly engage yracks 32 xed Ion themembers I4 in parallel relation to their rear slots 28, the rod being freely rotatable and being cylindrical at its slot-engaging bearing portions to permit its rotation as the seat is shifted.

Each of the plates I4 is provided with a similar set of openings comprising upright and'laterally spaced interior slots 33 intermediately of the sets of horizontalr slots 2I and 28, and catchbolts 34 normally-project from the plates I5 to l engage a said slot for securing the seat in foreand-aft adjustment. The bolts 34 are slidably and rotatably mounted in bores provided in cylindrical bosses or brackets 35 which extend inwardly from intermediate points of the plates I5 near their bottoms. The upper sides of the bosses 35 are provided withspiral cam'slots 36 which slidably receive arms 3'I which extend radially from the bolts 34 and engage theouter ends of the slots 36 when the bolts are operatively engaged in corresponding slots 33 of the plate I4. The arrangement is like that for the control of the bolts I6 whereby an appropriate rotation of. a

bolt 34 is arranged to effect an inoperative disposal of the bolt.

The simultaneous release of the normally oper- 54 engaged through said ends.

likestruts 45 which are cooperative in a common plane between the seat and block members 46 mounted on the rod and rotatably receiving the rod I'I therethrough, and are angularly adjustable with respect to the seat bottom. At their upper ends, the struts 45 mount rollers 4l which are arranged to constantly bear against the flat under faces of inwardly directed bearing plates 48 fixed beneath the seat and comprising extensions of the flanges I5 of the plates I5, and the lower strut ends are pivotally xed to the blocks 46. Mutually parallel gusset plates 48 and 50 connect the front and rear edges of each bearing plate 48 with its plate I5 and define between them a guideway in which the block 46 is secured and guided for its rectilinear adjustment withrespect to the seat. The arrangement is such that the seat is raised furthest from the rod I'I when the struts 45 are swung about their pivotal connections with the blocks toward upright positions thereof, and vice versa.

By particular reference to Figures 2 and 3 and 4 and 8 and 9, it will be noted that each block 46 is of general channel section having its sides 5I parallel and intermediately connected by a portion 52 which extends from the channel web 53 and is provided with a bore which receives the rod I'I for rotation therein. The strut 45 is forked and has its unforked end pivoted tof and between the block sides 5I for thepswingingr of the strut about an axis perpendicular to the rod axis. The free fork ends receive the roller 41 between them for rotation about a pvot pin At their outer 'faces the block sides 5I are pro-vided with longitudinal guide ribs 55 which are complementarily engageable in the channels of like and oppositely-directed offsets 56 of the plates 49 and 50, whereby the blocks are vguided by and between the plates for solely rectilinear movement to or from the seat which they carry. y

Understanding that a swinging'of a strut 45 to move the strut toward or from an upright position while the roller 41 thereof supportingly engages beneath ytheseat at av bearing platei 48 thereon is effective to respectively raise or lower v oirack bars v51 extending from pivotal connections with the diierent vstruts and "having 'the teeth of their racks 58 constantly engaging opposite 'sides 'of fa `gear-'58 xedlon' a -shait lIii which is rotatably mounted on and benea'ththe seat ybottom I3. As particularlydisclosed in Figures `3 and 4, the racks 58 -guidedly vextend into arrectangular casing 62 at opposite sides yof the gear A59 `andwith their teeth engaging "the gear within Ythe casing 4while Ithe backs of theracks slidably engage the finner 'faces fof opposite lcasing 'sides 63. 'I'he casing B2 *is'-Xed-to the 'seat botftom I3 intermediately-o'fitssides fto-disposefthe .1

rack and gear yassemblyfparallel thereto, and the gear s'haft 6| "is journalled in and between 'the opposed top -and bottom `sides of the casing 'in thefcommon plane of adjustment of the struts 45.

Hinged connections are provided between the `'jhe dog to .for "from :operative tpositioniinfi'eg- 'isteringqnotches 1andnl8.. iA compression spring :correspondingupperi points of :the depending seat `:plates IEinterniediate their .lengths` and in fpar-` :all'el Arelation 'to fthe rod` 2H. j 14 depend -iixedly `:from the s`ha'ft13 inwardly of `and ad'- jacent the plates to clear the bosses 35 forthe :bdlts:34,rand Alinks 15 and `16 respectively "connect the farms 1.11 kwith .the farms "26 of Ithe bolts T5 'and -wtthbottom points of thezmembers 10 which pro- '.vide the :dogs 69. arrangement "is such that a mocking-.of :the `shaft 1f3 in one` direction `will :effect a rwithdrawal .of thebolts rl6, while a rockiing .of 'the shaft in the (opposite direction will ef- `feet an `innpz-ir'ativc disposal .lof the dogs 69. Headed pins 11'1 Von the arm 14 `engage slots `18` andv '19in-the links 115 and 116 respectively `wherefbyla rocking of the shaft 13 to release the front '.orLthe.back-ofthefseat forlits'up or down :adjusten't does not simultaneously release the `rear or 'front of the seatfor its adjustment.' A

rack bars 51 and the struts 45; in the present instance, forks 64 fixed on the bar ends span eac'h roler 41 andthe strut endthereat, and refceive the rextremities of the pivot pins l51H70 provide the hinged `connection of the bars'and struts. The rack Abars fareiormed with-odset portions 65 between the racks 58 land the forks V64 to provide Yfor the engagement of their racks `at opposite sides ofthe gear 59. Compression spiings encircle the bar portions between `their racks 58 and the offsets 65 land are operatively eng-aged between the casing ends 1from which the "bars extend andseat collars 66 adjustably xed on the bars, said springs being constantly operative to urge an upward swinging of the struts 45 land a raising of the seat with a `toggle jack action. Since the springs 66 constantly urge `a disposal ofA the back 'of the seat in `fully raised positionwhen the seat is unoccupied, 'and the weight of an occupant of "the lseat `may rforce-the seat-down- 'wardlyagainst the resistance of Athe springs sto an intermediate Aor fully lowered position, `means are provided'for positively securing the back fof the seat in any one of a number lof adjusted positions with respect to the support base.

In the present instance, 'a 'means for securing theback of the seat at a desired adjustedheight is cooperative between the -blocks 46 v'on the shaft 'notches "61 and `68 to :positively support the )back ofthe seat upon ytherod l1. -Eachdog 69 is Aprovided at the 'lower end of va 'swinging member 1D Awhich has its vupper end'mounted on -a pin' 41-I extending from =the Aplate -'4`9\ for Ja swinging of- In the present structure, the Pshaft 13 extends beyond the left `:side .of the seat l'and carries an arm 8l xed thereto and normally extending-upwardly'from theshaft, `said arm bein-g 4provided with a knob 82 to facilitate -a manual rocking `of the armfand shaft 'to lselectivelyrelease the front or back of the :seat 'in thedescrib'ed 'manner and as "desired, With the present arrangement, a

`rear-ward rocking of the arm 8l is arranged to release therear of the seatfor adjustment, while a forward rocking lof Asaid arm releases the front of the seat for 'its adjustment. As shown, the support bracket 4.4 A'for the .extending Vend ofthe control 4rod 38 also Provides a support iorthe extending end of the shaft 113.

The described .common means which is provided `by the shaft 13 for selective actuationy to simultaneously `release .thefsupport bolts I6 lto permit aheight adjustment of :the front of the seat or to simultaneouslywithdra'w the dogs '69 to permit a height adjustment .'ofthe backrof :the seatobvious'ly permi'ts `the `release of the seat `for only one of said adjustments at `a :time Also, since the 'seat'fis of :relatively `rigid structure :and is constantly :supported "at :its back 'in parallel relation to the support `rod 111, it is importantto `note that the front of the Aseat will remain Sparallel to the common line of' the front bolts 4I6 during any adjustment thereof, whereby to "insurefan even front or `rear adjustment of vthe seat with V.respect to its two sides.

Rather than 'depend on 'the application 4 of ,a persons weight for setting the back of the seat in adjusted position .against the joint :resistance of the springs v66, rmeans .are preferably uprovided to positively 'actuate the rack `bars 51 ito eiect `the fdesired adjustment when the seat vvis free lfor vertical adjustment iwith respect to the ro'd 1|1. As particularly illustrated, :the shaft 6l for the rack gear 59 carries a worm gear V84 which is engaged 'by a worm shaft 85 Ajourna'lled on the under side of ythe casing 62 for-its turning to project or withdraw 4the rack bars 51 las a pos- `fitive height adjustment Ameans for the back Vof angular-relation to theasupportedseat for adjustmentonlygby turning the' shaft; the latter isA assumed 'in the present instance,v` whereby the support dogs 69 and Atheir action and control might'be omitted., vfzzi n p. i

As brought out in. Figure 3, the front end of the-worm-shaft 85istarranged for engagement byfarha'nd crank .86 for its fmanuallturning with -ai high degree 'of mechanicaladvantage. In this manner, the manual v'effort required for effecting an adjustmentat'the rear of the seat is minimized.; i I j :.Meansmay be provided in the described seat mounting structurelforso limiting the raising of thefseat vabove the floorf as to maintain-the operativeness of ,the .support elements to coact with and between the'baserand seat. As particularly illustrated, a member 88 'depends fixedlyfrom the seat-carried plate |5.opposite the outer sideof the Aplate 4 and is provided with a transverse bottom projection 89 directed toward'the plate I4 Yand engageable with a projection 99" extendingabove it-from la top part of the plate' |4 when supporty structure, the seatl structure being relativelyrigid against twisting or bending distortion. While of general utility, the present seat unit has also been particularly designed for its installation in a'vehicle, and comprises a pair of base mem- `abers; I I4. for fixing tothe floor ||2 toA extend upwardly therefrom, a pair of members II5 for i'lX- ing to the seat bottom I I3 to depend therefrom, andfront and rear pairs of bolts IIe and each engaging a pair of adjacent members I|4 and H5 at the different seat sides in a manner to support the latter members from the former. `The members I lllfcompriseplate elements of like size and outline'having base flanges |I4' for seating on the floor to which they Vmay be' secured as by bolts IIS. VThe members |I5 comprise plates of y likesize and outline havingY transverse top edge flanges I I5 at which they may be secured to the seat bottom II3 by bolts or the like, said plates being .disposed adjacent and i parallel to the interior face Vof the plates I I4'.

In front portions thereof, the plate members l I I 4 are provided with like sets of mutually parallel interior slots I2I which are laterally spaced in upright lines and extend parallel to the top edges of the members, it being noted that the top edges of the plates II4 are angularlyv related to the bottom edges of the plates and slope downwardly from their front ends. At corresponding points thereof adjacent the junctures of their front and lower edges, the Seat-carried plate'members' I |5 are provided with transverse guideways which slidably mount the support bolts IIS for their normal transverse projection from the plates I I5 into corresponding slots |21 of the plate I I4.

' The guideways for the bolts I I6 comprise aligned openings in the plates` |I5 and in brackets |23 extending rigidly from the inner sides ofthe plates I I 5, each said v bracket having. a cylindrically curved arm portion Y|24 overlying the bolt portion between the plate and its free extremity.

'z vA spiral'slot |25 is providedln ,each bracket arm |24 and slidably receives an arm |26 extending rigidly'from the bolt ||6 andiarranged to engage fthe forward slotA end 'as a stop when the bolt is operatively engaged in1a slot |2I ofr the base member vI I4; the arrangement isv such that-a sufficient rotation of the bolt to move its garm|26 rearwardly in the slot |25 will withdraw the bolt from its operative position by reason of the sliding engagement oil-the bolt arm |25-withfthe forward edge of the slot |'25.- Such a `rotation 'of the boltto effect its inoperative. disposal is arranged to be effected by a means simultaneously operative against both bolt arms I261and.\hereinafter described. i j' i The rear portions-of the base members I I4Y are provided with like sets of interiorslots |211- similai` to the sets of slots |2I, the-latter slots being parallel to the former. At corresponding points Ythereof adjacent the junctures of their rear and lower edges, the plate members |I5 are provided with transverse guideways which slidably mount the bolts II'l for their normal transverse projection from the plates I I5 into corresponding slots |21 of the plates I |5. Brackets |23gsuch as those which vmount'the bolts IIB are provided for the bolts I I'I and are provided with spiral slots |25 receiving arms |26 extending laterally from the bolts II`| in the manner previously` described for the bolts ||6.

With the support bolts |,I engaged in corre- -spondingforwardslots I2I of the base members |,|4and the support bolts engaged incorresponding rear slots |21 of. the: members, it will be understood that the seatis supported upon the base members I I4 for its fore-and-aft adjustment while it is maintained in a set angularity and height relation to the'supporting floor ||2. ATo provide for a maXimumdegree of fo-re-and-aft adjustment for the seat, the slots |2I and |21 of their different sets are of like length and have their centers spaced-as the line of` the boltsv I6 is horizontally spaced from the line of the bolts I Il. i U

As in the first-embodiment, means are provided to insure equal fore-and-aft adjustmentsY for theopposite seat sides. Inthe present structure, Va shaft |28 is journalled in and betweenthe plates H5 adjacent the seat and near the rear edge thereof in -parallel relation tosaid edge, and the extending shaft ends mount gears |29 lwhich are arranged to constantly engage the teeth of underlying racks I 30 provided on rigid arms |3| pivoted to the base plates I I4 adjacent'their upper front corners for swinging, as the back of the seat is raised or lowered, about an axis which is parallel to the axis of swinging of the seat on the front support bolts I I5, the shaft aXis also being parallel to the latter axis. The present racks |39 are provided at appropriate upper edge portions of the arms I3I, andl means are pro-vided to insure a constant operative engagement of the gears |29 with the opposed racks. 4

i As particularly illustrated-members |32 depend ,from and rotatively receive the shaft |28 outwardly of and adjacent the gears |29 thereon and 4extend opposite .the outer faces of the arms |3I to so engage the arms as to prevent a mutual separation of the gears and racks` while permitting anadjusted positioning of the gear longitudinally of the racks. The members |32 are provided at their bottoms ywith outturned flanges f |32' which aredisposed beneath and adjacent the `lower edges of strap-like. members I3I having their extremities xed tothearms I3! and having their intermediate portions spaced from and cooperative with said armsto provide guideways in which the members |32 are slidable longitudinallyof the arms while the flan-ges |32' cooperate with the lower edges of the members |3| to maintain the desired constant engagement of the racks with the corresponding gears.

Each of the plates i4 is provided with a similar set of upright and laterally'spaced interior sl'ots |33 intermediately cf the sets of horizontal slots |2| and |21, and bolts |34 normally project from each plate ||5 to `engage a said slot for securing the seat in fore-and-aft adjustment. The bolts |34 are slidably and rotatably mounted in bores provided in cylindrical bosses or brackets |35 which extend inwardly from intermediate points of the plates H5 near their bottoms. The upper sides of the bosses |35 are provided with .spiral slots which slidably receive arms |31 which extend radially7 from the bolts |34 `and engage the outer ends of the spiral slots when the bolts are operatively engaged in corresponding 4slots |33 of the plate i i4. The arrangement is similar to that for the control of the support bolts ||6 and H1, and of the bolts |6 and 34 ,of the first embodiment, and is such that an appropriate rotation of a bolt |34 is arranged, through the guided engagement of the arm |31 thereof in the slot of the boss |35 which carries it, to effect aninoperative disposal of the bolt.

The simultaneous release of the normally operative bolts |34 to permit a fore-and-aft adjustment of the seat with respect to the base provided by the members ||4 is arranged to be effected through an appropriate rocking of a rod or shaft |38 which is journalled in and between the plates I5 at corresponding forward and upper points thereof and inA parallel relation to the shaft |28. As particularly shown, radial arms |39 depend xedly from the `rod |38 inwardly of and adjacent the plates-l I5, and links |4| connect thearms |39 with the extending ends of `the bolt arms |31 whereby a rocking of the rod |38 may simultaneously withdraw both bolts |34. Tension springs |42 extend between the arms |39 and anchorages on the plates ||5 forwardly thereof to constantly and yieldinelv urge, ,through the links |4| and bolt arms |31, the operative disposition of the bolts |34.y At least one end of the control rod |38 extends beyond the adjacent base plate ||4 and flxedly carries a radial arm |43 for use as a handle to effect a rocking of the rod to simultaneously disengage the bolts |34 from the slots |33 of the plate; asshown, the handle |43 `is positioned opposite the left side `of the seat |08, and therod |38 is vsupported thereat by a bracket |44 fixed to and beneath the bottom seat `plate H3. y

A rock shaft |46 `is journalled in and between corresponding upper points of the depending seat plates I5 intermediate their lengths and in parallel relation to the shaft |28. Arms |41 depend fixedly from the shaft 1.46 inwardly of the plates to clear the 4bosses |35 for the bolts |34, and links |48 and |49 respectively connect the arms |41 with the arms |26 of the bolts ||6 and with the arms |3| of the bolts ||1. The arrangement is such that a ro-cking of the shaft |46 in one direction will effect a withdrawal of the bolts I6, While a rocking of the shaft in the opposite direction will effect a withdrawal of the bolts I |1. Headed pins |5| on the arms |41 engage slots |52 and |53 in the links |48 and |49 respectively whereby a rocking of the shaft |46 to release the front or the back of the seat for its up or down adjustment does not simultaneously release the rear` or front of the seat for its adjustment..

In the `present structure, the shaft |46 extends beyond the left side of the seat |89 and carries an arm |54 fixed thereto and normally extending `upwardly from the shaft, said arm being provided with vakndb |55 to facilitate a manual rocking of the arm and shaft to selectively release the front or back of the seat in the described manner and as desired, With the present arrangement, a rearward rocking of the arm |54 is arranged to release the rear of the seat for its adjustment, while a forward rocking of said arm releases the front of the seat foradjustment. As shown, the support bracket |44 for the extending end of the control rod |38 also provides a support for the extending end of the shaft |46.

Although vertical adjustments of the front or back of the seat |09 may be selectively effected by withdrawing the bolts ||6 or Ill while manually supporting the freed front or vrear seat edge, means are preferably provided for constantly urging a raised positioning of the back of the seat as an aid to positioning the same for the reengagement of the bolts |1 in corresponding slots |21 after an adjustment has been effected. As particularly sho-wn, the means for urging an upward disposal of the Iback `of the seat essentially comprises a toggle-jack arrangement at each seat end having links |56 and |51 respectively pivoted to the base flanges l| I4' and connected .at a common pivot pin |58, and urged toward a mutually aligned relation in which the back of the seat would :be fully raised .by the action of' a spring |66 which is appropriately operative with respect to said links. i

The present links |56 and |51 are bipartite and span an intermediate portion |6| of the pin |56 which is provided Vwith a diametral bore which freely receives a rod |63 pivoted on a. stub shaft |64 at a rear point of the plate` I4, said rod extending forwardly of the pin |58. A spring seat member|65 is adjustably mounted on. the free end of the rod |63 and an helical compression spring |66 receives the rod and is constantly operative between the member |65 and a seat ring |61 mounted on the rod and engaging the link ends adjacent the pinV |58. The varrangement is such that the springs |36 of the two toggle-jacks are jointly and equally A upward raising of the rear of theiseat for more than counterbalancing the supported seat Weight. It will, of course, be obviousdthat the action of the springs |66 is utilized only during an adjustment of the back of the seat when the support bolts |11 are inoperative, and the seat is supported upon the jacks through the arms 3| and racks |39 and gears |29 and shaft |28. Y

Means are provided for preventing the raising of the seat |89 appreciably above the level .at which `the :bolts 6 .and |1 may respectively engage the top slots 12| and |28 of the base plates H5. As shown, a member |68 depends xedly from each seat-carried plate ||5 opposite the cuter side of the adjacent base plate I4 and is provided with an inturned bottom projection |69 which underlies andis engageable with a projection |19 extending from the top part of the plate ||4 when the desired limiting height of the sea-t is reached. The arrangement and stop action are substantially identical with those for the members 88 and 90 of the first described embodiment.

From the foregoing description of my invention, taken in connection with the accompanying drawings. the advantages of the construction and operative to urge an il operation YwillV be readily understood by those skilled in the art to which the invention apper- -tains. While I have described the features and 'use' of assemblies which I now consider to be preferred embodiments of my invention, I desire "tohave it understood that the showings are primarily illustrative, and that such changes may be made, when desired, as fall within the scope of the following claims. 1 v I claim: -1. Invcombination with a seat, a seat-supporting means comprising transversely spaced :plate members supported in upright position beneath the seat in fore-and-aft relation thereto and Aprovided with like sets of vertically spaced' horizontal slots, corresponding pairs ,of laterally lspaced and horizontally disposed front and rear bolts reciprocably carried by the seat` and normally disposed selectively in slots 'of the' different plate members to cooperatively support the seat from the members in iiXed angular and height adjustment while permitting itsffore-and-aft adjustment,` rack bars pivoted to said plate members at corresponding points thereof in generally horizontal disposition for swinging in planes parallel to the members and having their racks facing upwardly, a shaft rotatably carried by and beneath theseat crossways thereof and above the rack-bars, gears on said shaft engaging the different said racks,

andmeans operative to maintain the cooperative engagement of the gears and their racks 'whereby the seat is restrained to like movements thereat during va fore-and-aft adjustmentthereof. f

`2. A structure in accordance with vclaim 1 having means constantly and resiliently operativethroughthe rack bars and gears and shaft to urge a raised disposal of theseat.

3; In combination with a seat,r a seat-sup- L :portingmeans'comprising a basefmember, a support element supportedly engaging the base 'member at a xed level thereof, a toggle strut 'hinged to said element and extending obliquely upwardly from its hinge point to a supporting contact with the seat, means operative to vary the Obliquityv of said strut for the support of the seat thereon at an adjusted height thereof, telescopically engaged guide members carried by the support element and seat respectively and cooperative to confine said element and seat to relative movement in a fixed line transverse to the seat, anda dogging means releasvably operative between said guide members to` secure the seat at its adjusted height.

4. In combination with a seat, a seat-supporting means comprising a base member dis'- posed beneatha seat in fore-and-aft relation thereto, guide members on the seat and base member telescopically engaged to guide the seat for a rectilinearly adjusted spacing thereof with respect to the base member, a toggle strut hinged tothe guide member and extending obliquelyV upwardly to slidably engage the seat for 'supporting it from the base member, and means on the seat operative against the strut to dispose and yieldingly nx the strut in angularly adjusted position with respect to the seat for providing a disposal of the seat at an adjusted height with respect to the base member.

`5. A structure in accordance with claim 4 having a dogging means releasably fixing the relatively adjusted guide members against relative movement.

6. In combination with a seat, a seat-supporting means comprising a base member disposed beneath a seat in fore-and-aft relation thereto and provided with a horizontal support face, avseat support element supportedly Vengaged with said face for fore-and-aft adjustment along it, members on the seat and support element telescopically engaged to guide the elementv and'seat for a rectilinearly adjusted spacing thereof, a toggle strut hinged to the guide member on said support element and extending obliquely upwardly to slidably engage the seat for supporting the seat from the element, and

.means on the seat operative against the strut to dispose and fix it in angularly adjusted posi- -tionwith respect to the seat for Providing a setting of the seat at an adjusted height with respect to the base member.

i A'7.In combination with a seat, a'seat-supporting means comprising relatively xed and transversely spaced base members disposed beneaththe seat in fore-and-aft relation thereto and .provided with mutually coplanar horizontal support zfaces, a support element supportedly restingiupon said faces and movable therealong,

complementary toggle struts hinged to the support element and extending obliquely upwardly from their hinge points to have their upper ends supportingly and slidably engage the seat, and means on the seat operativeagainst the struts at their upper ends and adjustable to adjust-the mutual spacing of the upper strut ends to change the Obliquity of`- the struts and thereby yadjust the spacing of the seat from the element.

distance between and connecting the upper strut ends and adjustable to move the upper strut ends toward or away from each other to change the obliquity of the struts and thereby,` adjust the spacing of the seat from the base members.

1 JOHN P. DE ROSE.

. 8. In combination with aseat, a seat-sup 

